Some pics from today:
(It was dark out when I remembered to take them, but now I have ELECTRICITY!

)
Rear door jamb and threshold with 1/2 inch lip:




Side utility door, also with a 1/2 inch lip around the opening:


Some interior shots:
The fantastic vent fan is hooked up and works great!

~240 amp hour battery bank:

Left side utility cabinet (battery charger, AC inverter, DC fuse bank, automatic transfer switch):

Right side utility cabinet (Tracer MPPT solar charge controller - no panel hooked up yet, but green light indicates charged batteries):

Light switches for the overhead LED's and porch LED:

And my trailer looking like Captain Nemo's Nautilus after dark.

I wonder if my build needs a code name? M116A3 isn't exactly easy to say. How about The Nautilus?